Hi there,
I would highly recommend Derrick Watterson of the Buildings Renovations Group (BRG), he's efficient and provides a high quality service at a great price. I've recommend him before to NV users with great reviews.
His company recently changed from Kensington Renovations to the BRG, but still best to contact him on his old email:
derrick@kenren.co.uk
Hope this introduction can be beneficial and best of luck with the works!